IOWA CITY, Iowa (AP) - Government statistics released this week claiming that 77 minors in the U.S. were killed by unintentional gun discharges last year significantly understate the scope of an enduring public health problem. A review of shootings nationwide by The Associated Press and USA TODAY Network found that at least 141 deaths of minors were attributed to unintentional or accidental shootings in 2015 - 83 percent higher than what the Centers for Disease Control reported. Advocates for stricter laws and new technology meant to keep guns away from children argue that many of the deaths are preventable, and the undercount is significant because it can skew the public policy debate...